
This post shares tips about how to seal clay pots for painting. If you’re wondering if waterproofing clay pots is an effective way to preserve a paint job, it is! I’ll walk you through using Thompson’s Water Seal on terracotta pots.
How to seal clay pots for painting & using Thompson’s Water Seal on terracotta!
Hey folks, today I’m chatting about how to seal clay pots for painting. Waterproofing clay pots is an essential step to complete before painting your pots, and it helps to preserve your paint job. And using Thompson’s Water Seal on terracotta is a great option.
This post specifically focuses on painting clay pots for outdoor use, but I follow a really similar process for painting pots for indoor use. Check out my detailed post about waterproofing indoor clay pots and painting them with acrylic paint. Outdoors, I’m doing a bit of painting for some of the container veggies and plants I’m planning for the backyard, so I’m putting this sealer to work lately.
If you need to strip old paint from your pots first, check out my tutorial on how to remove chipped paint from clay pots before painting them. (That project uses Thompson’s Waterseal in an aerosol version.)
Want more outdoor posts? See my full backyard post here! I also have a post about how to clean an outdoor rug, how to build an outdoor coffee table using concrete pavers, and my review of using Ready Seal to stain and seal our fence.

Do you need to seal clay pots before painting?
Yes. I have painted a lot of terracotta pots for both indoor and outdoor use. And I have yet to find a paint that stands up to its claim to be a sealer and paint in one. And that includes the outdoor paints I’ve used—the ones that claim you do not need to use a sealer. Here’s why.
Terracotta is, by nature. extremely porous. The terracotta soaks in excess water from the soil to help protect the roots. Then, the soil is able to dry out faster. This helps to prevent overwatering, but it can sometimes lead to a lack of moisture and caked, shrinking soil if you’re not careful.
So when you seal terracotta, you are giving up some of the benefits that terracotta has for plants. I haven’t had any issues with the plants in my sealed and painted pots—it’s just something to keep in mind. You do need to seal clay pots if you’re painting them, though. Because terracotta is so porous that it will take in all of that extra moisture and lead your paint job to bubble, crack, and peel.
Even sealing terracotta pots before painting them isn’t a permanent solution, though. Water can do a lot of damage, as can the elements (sun, rain, etc.). Waterproofing clay pots is a good way to lengthen the life of your painted pots. Bringing them indoors or putting them in sheds during the fall and winter helps, too.



About Thompson’s Waterseal Clear Multi-Surface Waterproofer
So what do I use to seal pots? Here’s a bit about the waterproofer and why it’s my product of choice to seal clay pots for outdoor use:
- The Thompson’s Waterseal website indicates that it will effectively seal any porous material against damage by water, including concrete, brick, stone, plaster, wood, canvas, and asbestos. So I figured it would be up to the task of sealing clay.
- It’s clear and has a nice consistency. It’s pretty watery, a lot like a water-based polycrilic if you’ve used that. When painting on clay, it’s easy to see where you’ve painted because it just makes the pot look wet.
- It doesn’t have a terribly strong odor, and the odor it does have dissipates pretty quickly. Even when I painted in the garage.
We have a 1.2 gallon jug of this stuff, but it’s also available in a quart option and a handy aerosol spray for smaller projects. I use a disposable chip brush when working with this sealer so that I can just chuck it when I’m done and not have to deal with mineral spirits cleanup.
I used Thompson’s Waterseal Clear Multi-Surface Waterproofer first on the very large pot in the pic with the snake plant below. Even though I did use a paint designed for outdoor use on this pot, the clay was super porous, and I was afraid it wouldn’t stand up to the elements (and the moisture of a ton of wet soil on the inside).


The best place to buy big clay pots for cheap
Now we know why to seal clay pots before painting them and what to use…but where do you get a big clay pot? Big pots are EXPENSIVE. Go to any home decor or big box store and you’ll fall in love with a pot, only to have your yikes meter run off the charts when you see the price.
But big pots are also very pretty—and necessary if you’re planting something that needs a bit of room. Enter Ollie’s Bargain Outlet. One of my favorite stores…and DEFINITELY a favorite for pots. In the spring and summer, they have a buttload of pots to choose from. And they aren’t cheap plastic ones, either.
They are beautiful clay pots, many of which are also glazed. Just yesterday I came home with three giant pots. One for $20 (black glazed), one for $12 (blue patterned one), and one for $10—the yellow beaut I’m going to be working on in this post.


Waterproofing clay pots with Thompson’s Water Seal
So this yellow one…I loved the lines on it and the size was perfect for the space I wanted. The yellow just wasn’t going to cut it, though, so I decided to break out some paint. I really wanted to do this pot in a navy color for the backyard.
However, when I got out my royal blue and black outdoor paints to mix together, I realized that I hadn’t completely shut the blue when I’d opened it last. Noooo. It was ruined. Super chunky and totally unusable.
I really had my heart set on navy, but I decided to take the easy way out and use the white I already had on hand: DecoArt Curb Appeal in Farmhouse White. It would look nice next to the white pots I already had near the area this pot was going. And it would help tie in the bright white trim on the deck a bit more.

Sealing this bad boy
So to seal this pot, I just brushed on the Thompson’s Waterseal Clear Multi-Surface Waterproofer using a chip brush. I did a few coats on the inside and outside of the pot since both sides were unsealed. The instructions on the water seal say to wait a while before painting over it, so I officially recommend that strategy. 🙂
However, I did not follow the directions because I am impulsive and impatient. I left it to dry overnight under a fan and painted the next day. Here’s the first coat of white paint brushed on—I did two coats. And then the lovely finished pot, sealed and painted for a beautiful fit in my space.





If you like outdoor DIY projects, make sure to check out my DIY AC unit screen, my DIY paver side table, my modern trellis for a vining plant, and my roundup of vertical and container gardening ideas.
Pin my tips about waterproofing clay pots using Thompson’s Water Seal!


How to Seal Terra-Cotta Pots
Their adaptable good looks mean terra-cotta pots can fit in anywhere indoors or outdoors, and they’re easy to find and inexpensive too. However, they happen to be highly porous, which means that it’s a good idea to seal terra-cotta pots to keep moisture from seeping through the walls. You don’t have to be crafty to seal a terra-cotta pot, but there’s something about setting up a "paint zone" and gathering brushes that may inspire you to paint your terra-cotta pot before you seal it. Either way, you may enjoy the opportunity to temporarily trade your green thumb for a crafter’s thumb, knowing that your plants will benefit from your time investment.
Size Up Terra-Cotta Pros and Cons
Even projects that aren’t particularly time-consuming have a way of triggering doubts at the outset. In this case, you may want to ensure that there are more advantages to using terra-cotta pots than disadvantages. From any vantage point, terra-cotta can withstand the scrutiny.
Among the benefits, Officially Planted notes that terra-cotta looks natural when paired with green plants or flower stems because it’s a fired clay, which is another natural substance. In fact, "terra-cotta" means “baked earth” in Italian. Terra-cotta is strong and durable, and it’s surprisingly resistant to mold and bacteria. The indoor/outdoor versatility of terra-cotta is enhanced by the fact that you can find pots in virtually any size – from miniature 2-inch pots for seedlings to 20-inch pots that can steady ficus and orange trees.
Terra-cotta’s porosity means that pots dry out much quicker than ceramic or plastic, requiring gardeners to be much more watchful and vigilant about watering. A recently watered plant housed in terra-cotta can be surprisingly heavy to move or lift, a reality that has caused more than a few gardeners to discover another disadvantage: Terra-cotta tends to chip and break easily when dropped.
Hold On to That Terra-Cotta Sealer – For Now
If painting is not your thing and not even a simple stencil, stamp or sponge design can persuade you otherwise, you can leave your terra-cotta pot as it is and skip right to the sealing. Just remember that a painted pot should be sealed at the end, so even if you wish to scrawl only your initials on a pot, you should do so before you use a clay pot sealer.
Whether you’re using a new terra-cotta pot or an old one, it’s always a good idea to wash it with mild dish soap and water to remove dust and dirt. Let the pot dry thoroughly; depending on the amount of moisture in the air, this could take as little as overnight or as long as several days, says Get Busy Gardening. It’s not fun to wait, but at least you’ll have time to set up your work space, laying down an old bed sheet or thin blanket on a sturdy surface.
If you wish to paint your terra-cotta pot a single color, you may wish to use spray paint (in several thin coats instead of one heavy coat). To create a design or use more than one color, chalk paint or acrylic craft paint will work well. The latter can be found in dozens of colors at craft stores. Applying the paint with a foam brush will help ensure that the paint glides on smoothly. Once it dries, you’re ready for the capstone event.
Apply Clay Pot Sealer With Confidence
There are dozens of sealants on the market, so you should start your search by deciding whether you’d prefer to spray on the sealant or exert more control over the coverage with a brush. Spray-on sealer cans might recommend applying the product in a well-ventilated area, but take the tip one step further and apply the spray outdoors. You'll breathe easier. Some of your top choices include:
- Thompson’s water seal
- Plaid clay pot sealer
- Aleene’s acrylic sealer (which comes in gloss but looks better in matte on terra-cotta)
Just as you may have to apply at least two coats of spray sealant, prepare to apply multiple coats of brush-on sealant, especially if you didn’t paint your terra-cotta pot first, says The Inspired Home and Garden. (The pots, as you know, are porous and so will absorb the sealer quickly.) Some of your top brush-on choices include:
- Delta all-purpose sealer
- Mod Podge
- DecoArt Americana multipurpose sealer
You’re likely to get different advice about whether to seal your terra-cotta pot from the inside, outside or both, but there’s no doubt that both is the most conscientious approach. Sealing the inside will provide a protective barrier where it’s needed most, but going the extra mile to seal it from the outside will ensure that the terra-cotta finish looks consistent on the inside and outside. Many people even apply terra-cotta sealer to the bottom of the pot to protect against scratches.
Things You Will Need
Mild dish soap
Old bed sheet or thin blanket
Spray paint, chalk paint or acrylic craft paint
Foam brush
Sealant
References
Tips
- Use another coat of terra-cotta sealer instead of the patio paint if you want to retain the original color to the pots.
Writer Bio
<p style="margin-bottom: 0in"><font style="font-size: 16pt">Mary honed her journalism skills in two of Chicago's scrappiest newsrooms: The Daily Herald and then the Chicago Sun-Times. She took this knowledge, combined it with her experience in running two marketing communication companies and now writes about communication, marketing, careers and other timely business topics for myriad national publications. </font> </p><p style="margin-bottom: 0in"><font style="font-size: 16pt"><br></font></p>
How do I seal clay pots?
It takes a long time for water to erode the clay of a pot; the white stuff you see is mineral buildup. (Now, being left out through freezing-thawing cycles where they can get wet, that will get you a big pile of cracked pots in the spring, ask me how I know :/ ) Some plants love the airflow and drainage afforded by unglazed clay --- anything from a Mediterranean climate, and especially succulents (for beginners), I strongly suggest unglazed clay.
But my African violets, cyclamen, mandevilla, most of my tropicals, really --- anything that wants to stay "moist but not wet" --- they get plastic or glazed clay/ceramic, because they *want* the water retention. (It is perhaps even more important to make sure that these plants get well-draining soil with lots of perlite or grit, as even the most water-loving plants still need oxygen to their roots.)
Choosing the right pot and soil for the particular plant can be the most important factor in that plant's success this season. If the plant's needs are "fast-draining," if they tell you to let it dry out between waterings, these are indications that unglazed clay will do beautifully. If it has that magic "consistently moist" requirement, though, you want something non-porous.
Regardless of which type, it's important when watering containers to thoroughly drench, until water runs out the bottom. Otherwise, minerals from your water can build up in the soil and block the roots from getting what they need. This also means that you need to fertilize more frequently, as the nutrients get washed out more quickly.
TRICKS/IDEAS: Waterproofing Clay Pots
Todd March
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like to share a trick I have found very useful...
I prefer to grow in plastic pots--they hold more water in my growing
area; I grow a few large Catts in untreated clay, but it is so porous it
just wicks the water away too fast for most of my orchids... Problem is
that plastic pots can be hard to find in certain sizes--particularily
"rose style" pots that are very deep and ideal for Paph and Phrags with
long roots...
I utilize something called "Universal Terra Cotta Sealer", which is just
a Vinyl Latex Emulsion, to seal and waterproof clay pots. This sealer is
odorless, non-toxic, cheap at $4 a jar, and easy to use; it rinses
completely and easily with water. It has the consistency of milk, and I
apply 4-5 coats to both the inside and outside of the pot, allowing them
to dry in-between; total time is around 15-20 minutes to seal a batch of
pots. Once its' totally dry after a few hours, it's totally safe for
plants, and is sealed from moisture for many years.
I have made some rose style pots that measure 6" X 8" for some larger
Phrags and Paphs, and the plants just seem to love these pots. They seem
to invite a lot of root activity, and I suspect this might be due to the
better temperature insulation factor from the clay--sealed or not. I
recently un-potted a mature Paph. Michael Koopowitz that was not
actively working on any growth to see what was going on with it's roots,
and found that it had grown extensive new and fat healthy roots in its
treated clay pot in the last six months while it looked so dormant. It's
the fastest I have ever seen a Paph, let alone a sanderanium hybrid,
grow roots...
If you have a need for some odd shaped pots, or like the weight and
insulation of clay pots, but not their penchant for robbing water, I
highly recommend that you try treating clay pots to make them
water-tight like plastic. I have seen the Terra Cotta Sealer at some
Home Depots, and I buy it from my local fancy nursery and pot dealer.
One $4 jar would coat countless pots; a little goes a long way...
Hope this helps someone, and I like forward to the next trick someone
shares...
Best--
Todd
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Todd March
Los Angeles, California
SEE my AMAZING apartment GREENHOUSE on the web at:
http://home1.gte.net/tmarch2/toddsgrow/growindex.html
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Gene Schurg
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look around the pots or in the paint section?
Gene
Todd March
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after 4-5 coats, leaves a shiny, glossyish and slick surface... Most
people like it, others hate it--missing, they tell me, the wonderful
weathering and mineraling untreated clay pots aquire on their surfaces...
But caring more about a great functioning pot for my precious orchids, I
haven't cared much about the aesthetics...
Todd March
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I found The Terra Cotta Sealer out in the desinger pot section of my Home
Depot, a few feet from the orchid plant section actually...
Our Home Depot no longer carries the Terra Cotta Sealer, saying that it was
discontinued, though I did see it a few months ago at a Home Depot store in
San Jose, California... So I am unsure if the Home Depot Corporation no
longer carries it, or just our store (which is a huge fully stocked
flagship store)...?
The independent guy that sells it to me now says it has been around for
years and is usually available somewhere if you check around, or contact
the company.
If anyone wants the information for the company, here is what I have:
Universal Terra Cotta Sealer™
Universal Mfg. TCS
P.O. Box 36773
Phoenix, AZ 85067
Something I didn't mention in my original post is that this sealer, after
4-5 coats, leaves a shiny glossyish slick surface... Most people like it,
others hate it; missing the wonderful weathering and mineraling untreated
clay pots aquire on their surfaces...
Andrew
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If you still want the old, cruddy look, you can always seal the inside
only. That will still stop moisture loss from the media but allow the
pot to weather naturally (although probably at a slower rate).
Personally, on anything but the huge tubs I like the clean glossy
finish.
Andrew
Diana Kulaga
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sterilize the coated pots? I generally use plastic for the obvious reasons,
and then place the plastic in a larger clay pot for ease of hanging (use a
lot of pot clips that won't work with plastic) and a better look. I
presently use a chlorine solution to sterilize..........do you think the
chlorine would eat up that coating?
Diana
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Gideon Singer
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Great idea on treating clay pots. What media do you use in the pots
for Paphs and Phrags?
--
Gideon Singer
Webpage: members.home.net/gsinger
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Terracotta sealant non pots for toxic
Waterproof Terracota Pots Using Liquid Rubber

Easy Inexpensive and Eco-friendly
Waterproof Garden Pots, Urns, Bird Baths and Fish Ponds
Terracotta -- which comes from the Latin "terra cotta," or "baked earth" – are traditional containers for plants and look great in most settings. The “earthy” look of a terracotta pot is a bit more aesthetically pleasing than plastic containers!
However terracotta pots are porous and this causes a number of problems, predominately water will soak through the pot or urn unless it is sealed and waterproofed.
This means terracotta pots dry out t fast and always require frequent watering.
And frequent watering also means more frequent feeding as watering washes the nutrients out of the soil with each session.
Using Liquid Rubber is an easy, cost effective way to seal and waterproof all your garden pots and so reducing your maintenance watering. Liquid Rubber is eco -friendly and safe all plants and animals.
And while you have a paint brush and a bucket of Liquid Rubber out for your garden pots, how about waterproofing your birdbath and fish ponds as well !


Liquid Rubber is eco-friendly meaning it is non-toxic for your plants as well as non hazardous for you to apply.
Before applying Liquid Rubber, and especially if it is an old pot, give it a good scrub to wash away loose debris and any lingering diseases problems which could hinder the healthy growth of your new plants.
Scrub inside with cold clean water and a wire brush.
Once your pot has been properly cleaned and all loose debris removed, now all you need to start waterproofing is a bucket of Liquid Rubber, gloves to keep your hands clean and a standard paint brush.
You only need to waterproof the inside surface of your pot.Apply Liquid Rubber evenly with your paint brush. If a terracotta pot has developed cracks, Liquid Rubber will bridge these cracks and seal from the inside and preventing further spread of the crack.
Let your terracotta pot dry thoroughly before planting.
Click below to purchase DIY Waterproofing buckets
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But unfortunately I can't do anything. I decided this was my only chance. As long as the daughter-in-law feels compassion for my misfortune, something can work out. My balls were about to explode, I just needed a release.